Dental instrument



Dec. 2, 1930. w. A. KELsr-:Y 1,783,654

DENTAL INSTRUMENT Filed oct. 1o, 1927 5 P1 5 la /0 Z. l5 'Z0 mulZNVENTOR WML/,4M A Kasey Patented Dec. 2, 1930 WILLIAM A. KnLsEx-'orMINNEAPOLIS, MINNESOTA i v1,783,654 l OFFICE VDENTAL'INS'IRUMENTAppncanonmed october 1o, 1927. serial No. 225,358.

This invention relates to new and useful improvements in dentalinstruments, and particularlyf` to such instruments 'comprising ahandlepor-tion having a tool demountably re- 5 ceived -in one endthereof, and, of theclass generally used in the dental profession forscraping andcleaningteeth, preparing cavi'-V lo A A n object oftheinvention is to provide a dental instrument comprising an elongatedbody providing a iingerlgripffor the instrument and having asocket at`one lendthereof adapted to receivethe shank; ofV a tool, and astem'being received in threaded engagement with the opposite end of thebodyand co-operating therewithn to providethe handle for the instrument, anda locking memberbeing pivotally mounted in said body andhaving one endadapted: to be engaged by theterminal of Vsaidlocking screw where-'bytheV lockingv member maybe moved into locking engagement with lthetool shank, to secureitto'the body. r` Y- Y A further obj ect ofvthelinvention is to provi'de a dental instrument-comprising a'body'having a* tool-receiving socket provided in `one end 'thereof-and'arranged at a slight angle with respect to the axis of the body, `and amlocking screw being received in threaded engagement `with the oppositeend ties, Carving wax forms, and various similar offthe body and(1ooperating therewith to fprovidefa handle fortheinstrument, V and aplate-like locking member `being mounted within said body and having oneend arlranged to be' engaged by said locking screw,

the opposite endof said locking member havli110` means for en a ino'andofri pin atool Shnk, when the inegmia 'is ceiafedgby the lockingscrew, and said lockingmember also lhavingan inclined face adapted toengage the end'of the tool shankv and translate' it in an outwarddirection to partiallyremove'it from the body, whensaid llocking screwhas been moved outof1 engagement with the locking member, and the latteris actuated.`

A further, object is to provide adental instrument of the classfrdescribed comprising a handle portion having means for demountablyreceiving a dental' tool, saidinstrument Vbeing provided witha` simpleand eiiicient locking means for securing the tool shank Vin said handleportion, said locking means Y being conveniently operable, whereby atool may be quickly removed from the handle and another one substitutedtherefor.

The particular object of the invention, therefore, is to provide animproved dental instrument of the cla-ss described.

- Other objects of the invention will appear so from the followingdescription and accompanying drawings and vvillv be pointed out in i theannexed claims. In the accompanying drawings, there has been disclosed astructure designed to carry 365 di out the various objects of theinvention, but itis tobe understood that the invention is not coninedjto the exact features shown as various changes may be made within thescope of the claim which follow. f im In the accompanying Vdrawingsfor-ming part of this specification:

Figure lis a longitudinal sectional view ofthe improved instrumentshowin@n the locking member engaged with a tool shankto r1.5 lock thelatter to the body; i Y I Figure 2 is a similar view, sligh lyenlargecl, showing the locking member in unllocking position and furthershowinothe b .L 7 b means provided thereon for translating the so shankof the tool in an outward direction to remove it from the body; Y

`Figure `Sis a cross sectional view on the line of Figure l; i l Figure4 is a cross-sectional View on the 85 line 4-4 of Figure v1;"and gFigureV 5 is a View showing the tool`re- Y moved from the body.

rl`henovel dental instrument featured in this invention comprisesanelongated body 2, having a socket 3 provided at one end thereof adaptedto receive the shank 4 of a tool 5, as shown.'v The axis Vof the socket3 is preferablyarranged at an angle with respect to the axis ofl theVbody 2 andis also 95 off-set therefrom as indicated by the dotted `linesa-a and b-b. Anotch 6 is terminally provided in the body 2 adapted toreceive a tongueor attened portion 7 provided upon; the shank l :of thetool. Whenthe l100 notch 6 and tongue 7 are interlocked, the tool shankwill be prevented from turning or rotating in the socket 3.

The means provided for securing the tool shank in the socket 3 consistsof a locking member 8 mounted in an elongated recess 9, provided in thebody 2. The locking member 8 is pivotally mounted upon a pin 10 asshown. A detent 11 is provided at one end of the locking member 8 and isadapted to be received in a notch 12 provided in the tool shank asshown, particularly in Figures 2 and 5. An inclined face 13 is alsoprovided in the locking member 8 adjacent to the detent 11. Thisinclined face is adapted to engage a beveled face 14 provided at the endof the -tool shank 4. The purpose of the beveled faces 13 and 14C is toprovide means for translating the tool shank in an outward direction inthe socket 3, when the locking member is moved into unlocking position,as shown in Figure 2.

A locking screw 15 is received in a threaded socket 16 provided at theopposite end of the body and has a cone-shaped terminal 17 adapted toengage the inclined face 13 of the locking member, as shown in Figure 1.The axis of the socket 1G is also oit-set from the axis of the body 2 inthe same direction as the axis of the tool-receiving socket 3. Thelocking screw has a stem 19 which co-operates with the body 2 to providethe handle for the instrument. A knurled head 2() is provided at theouter end of the stem 19 to provide means for conveniently rotating thescrew 15 to move the terminal 17 into and out of locking engagement withthe inclined face 13 of the locking member 3.

In the operation of this novel instrument, the shank 4 of the tool isinserted into thc socket 3 until the tongue 7 is received in the notch 6provided at the end of the body. The pivotal mounting ot the lockingmember S within the recess 9 is such that when the tool shank isinserted into the socket 3, the beveled face 14 thereof, will engage thebeveled face 13 of the locking member and cause the latter to be movedinto locking position substantially as shown in Figure 1, when the toolshank reaches the position shown in this iig ure. The locking screw 15is then rotated to move the terminal 17 into engagement with theinclined face or edge 18 oi'nthe locking member, thereby causing thelocking member to securely grip the tool shank and thus secure it to thebody portion 2 ot the handle. Then it is desir-ed to remove the toolshank from the socket 3 for the purpose of changing tools, and so on,the locking screw 15 is translated outwardly substantially to theposition shown in Figure 2, after Vwhich the locking member 3 may beoscillated upon the pin 10A by applying a slight pressure thereto at thepointindicated at P, thus causing the inclined face'13`of the latchmember to move the tool shank outwardly to the position shown in Figure2, after which it may readily be withdrawn from the socket and a newtool inserted therein. One edge of the lock ing member 8 preferablyextends beyond the periphery of the body 2, so that pressure may beapplied thereto at the point I), when it is desired to remove the toolshank from the socket 3. The sockets 3 and 16 are preferably offset fromthe axis of the body 2, as hereinbefore stated, so that when theinstrument is in use and pressure is brought to bear on the body 2 atthe point indicated at P1, there will be no tendency for the instrumentto turn or rotate in the operators hand.

I claim as my invention:

1. In a dental instrument, the combination of an elongated body shapedto provide a inger grip for the instrument, a tool-receiving socket inone end of said body having its axis disposed at an angle with respectto the axis of said body to prevent relative rotation of the instrumentwhen held in the hand of an operator and lateral pressure is brought tobear thereon, a threaded socket in the opposite end of said body adaptedto receive a locking screw, and a locking member mounted in said bodyand adapted to be engaged by said locking screw whereby said lockingmember may be moved into locking engagement with the tool shank tosecure it to said body.

2. In a dental instrument, the combination of an elongated body shapedto provide a nger grip for the instrument, a'tool-receiving socket inone end of said body arranged at an angle with respect to the axis ofthe body to prevent relative rotation of the instrument when heldin thehand of an operator and lateral pressure is brought to bear thereon, athreaded socket in the opposite end of said body having a locking screwadjustably mounted therein, and a locking member mounted on said bodyand having one end arranged to engage and grip a tool shank inserted insaid tool-receiving socket, and the opposite end ofV said locking memberbeing adapted to be engaged by said locking screw to cause the member tosecure the tool shank in said body.

3. In a dental instrument, the combination of a body forming a lingergrip Jfor the instrument, a tool-receiving socket in one end of saidbody arranged at an angle with respect to the axis thereof to preventrelative rotation of the instrument when held in the hand of an operatorand lateral pressure is brought to bear thereon, a locking screwreceived in threaded engagement with the opposite end of Vsaid body, arecess in one side .of said body, and a plate-like locking member orlatch pivotally mounted within said recess and having one end adapted'to engage a tool shank to lock the latter to said body said lockingmember having its opposite end adapted to be 'engaged by'said lockingscrew, whereby said locking member may be moved into locking engagementwith the tool shank.

4f. In a dental instrument, the combination of a body forming a lingergrip for the instrument, a tool-receivingV socket in one end ofsaid'body arranged at an angle withrespect to the axis thereof toprevent relative rotation of the instrument when held in the hand of anoperator and lateral pressure isbrought to bear thereon, a locking screwreceived in threaded engagement with the opposite end ofsaid body, arecess in one side of said body extending substantially the lengththereof, and a plate-like locking memi ber or latch pivotally mountedwithin said recess and having one end adapted to engage and grip a toolshank to lock the latter to said body, said lockingmember having itsopposite end adapted to be engaged by said locking screw, wherebythelocking member may n be oscillated to grip the tool shank.

5. In a dental instrument, the combination of a body having a socketterminally pro vided at one end thereof and adapted to receive a toolshank, a threaded socket at the opposite end of the body adapted toreceive a locking screw, the stem of which co-operates with said body toprovide a handle for the,

instrument, a locking member pivotally mounted within said body andhaving one end adapted to be engaged by said locking screw, andtheopposite end of said locking member having means thereon adapted toengage and grip a tool shank inserted in said tool-receivingY socket,said locking member also having a face adapted to engage the end of saidtool shank and move it in an outward direction, when said locking screwis moved out of engagement with said locking mem! ber, and pressure isapplied to the opposite end of the member.

6. In a dental instrument,the combination of a body having a socketterminally provided at one end thereof, adapted to receive a tool shank,a threaded socket at the opposite end of the body adapted to receive alockingl screw, the stem of which co-operates with said body to providea handle for the instrument, a locking member pivotally mounted withinsaid body and having one end adapted to be engaged by said lockingscrew, and the op# posite end of said locking member having meansthereon adapted to engage and grip a tool shank inserted in saidtool-receiving socket, said means preventing withdrawal of the toolshank from the body when the locking member is in locking position, saidlocking member also having means thereon for translating the tool shankin an outward direction when said lockingv screw is movedf out ofengagement with said locking member. In witness whereof, I have hereuntoset my hand this 5th day ofOctober, 1927.

WILLIAM A. KELSE-Y.

